Results 71 to 80 of about 3,278,550 (239)
Evolution of Gas and Dust in Circumstellar Disks [PDF]
Symposium - International Astronomical Union, 2000 A clear understanding of the chemical processing of matter as it is transferred from a molecular cloud to a planetary system depends heavily on the physical conditions endured by gas and dust as these accrete onto a disk and are incorporated into planetary bodies.
openaire +2 more sources
Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity
Small Structures, Volume 7, Issue 3, March 2026.The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley +1 more source
Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514
The Astrophysical Journal LettersWe report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su +10 more
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Circumstellar Gas in the Wide Binary HD 188037
The Astrophysical Journal, 1997 We report radio, optical, and ultraviolet studies of the wide binary HD 188037 (=IRC +20439). We detect the CO (2-1) and (1-0) rotational lines from the circumstellar envelope in this system, which consists of a luminous (~7000 L☉) mass-losing M-type star and, at a separation of 075, a main-sequence A-type star. The strong (2-1) line has a very unusual
M. Jura, C. Kahane, D. Fischer, C. Grady
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Journal of Advances in Modeling Earth Systems, Volume 18, Issue 2, February 2026.Abstract Hot and moist “hothouse” climates occurred in Earth's past and are expected in Earth's far future climate, driven by increasing solar luminosity. In hothouse climate regimes, precipitation transitions from a quasi‐steady state, as in present‐day tropical convection, to an “episodic deluge” or relaxation‐oscillator (RO) regime where ...
Namrah Habib, Guy Dagan, Nathan Steiger
wiley +1 more source
The Astrophysical JournalProtoplanetary disk evolution can be deeply influenced by the UV radiation emitted by neighboring massive stars (mainly of spectral types O and B). We show that the process of external photoevaporation , which causes an outside-in depletion of disk ...
Rossella Anania +20 more
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Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey +3 more
wiley +1 more source
The viscous evolution of circumstellar discs in young star clusters
, 2018 Stars with circumstellar disks may form in environments with high stellar and gas densities which affects the disks through processes like truncation from dynamical encounters, ram pressure stripping, and external photoevaporation.
Concha-Ramírez, Francisca +2 more
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Circumplanetary disks around young giant planets: a comparison between core-accretion and disk instability [PDF]
, 2016 Circumplanetary disks can be found around forming giant planets, regardless of whether core accretion or gravitational instability built the planet.
Mayer, L., Quinn, T., Szulágyi, J.
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The Astrophysical JournalWe present high-resolution (∼0 $\mathop{.}\limits^{^{\prime\prime} }$ 05; 8 au) dust continuum and molecular line observations toward the Class I protostellar system IRAS 04169+2702 in the Taurus B213 region, as part of the Atacama Large Millimeter ...
Ilseung Han +24 more
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